| Clue | Source | Date |
|---|---|---|
| A message about gutted backcountry ravines | ||
| Very deep places | LA Times Daily | 17 Nov 2016 |
| Deep gulfs | LA Times Daily | 07 Apr 2016 |
| Bottomless pits | Eugene Sheffer | 04 May 2015 |
| Bottomless pits | ||
| Bottomless pits (var.) | ||
| Bottomless places | ||
| Bottomless pits | ||
| Bottomless pits | ||
| Deep gulfs | ||
| They're the pits | ||
| Unfathomable deeps | ||
| Bottomless pits | ||
| Chasms, to Cowper | ||
| Depths: Poet. | ||
| Bottomless gulfs. |